Addition of N-Heterocyclic Carbenes to a Ruthenium(VI) Nitrido Polyoxometalate: a New Route to Cyclic Guanidines. - Besson, Claire; Mirebeau, Jean-Hugues; Renaudineau, Severine; Roland, Sylvain; Blanchard, Sebastien; Vezin, Herve; Courillon, Christine; Proust, Anna (Inorganic Chemistry, 2011)